Provided by: bwm-ng_0.6.1-5_amd64 bug


       bwm-ng  - Bandwidth Monitor NG (Next Generation), a live bandwidth monitor for network and
       disk io.


       bwm-ng [options] ... [configfile]


       bwm-ng can be used to monitor the current  bandwidth  of  all  or  some  specific  network
       interfaces  or disks (or partitions). It shows total of in and out as well as total of all
       interfaces/devices. Several different  output  methods  are  supported  (curses,  curses2,
       plain, csv and html).

       bwm-ng  is  not  limited  in  the  number  of  interfaces or disks and can handle new ones
       dynamically while its running or hide those which are not up.


       The input methods used pretty much depends on your OS and  system.   You  can  choose  the
       preferred  method  either  at start or in curses during run-time.  Each method can only be
       used if bwm-ng was compiled with support for it.

       Currently supported network input methods:

                  This is the default for Linux based systems. It parses the special procfs  file
                  /proc/net/dev. This should be used if in doubt in Linux.

                  This is the default on BSD systems like FreeBSD, NetBSD, OpenBSD and recent Mac
                  OS X (>=10.3). This should be used if in doubt on those systems.  It  uses  the
                  getifaddrs systemcall.

                  This is the default for Solaris. It uses the kstat systemcall.

                  This is the default on Systems like IRIX and other UNIX. It can be used on many
                  other systems like early Mac OS X as well. It uses the sysctl systemcall.

                  This is a Backup for systems without the above, or other problems.

                  bwm-ng can use the external library libstatgrab  to  gather  the  data.  please
                  refer to for more info about this.

       Currently supported disk input methods:

                  Shows  the  diskio  on  Linux  2.6+  systems  using /proc/diskstats. Instead of
                  packets the number of read/writes will be shown.

                  same as kstat network input but for disk io. It uses the kstat systemcall  from

                  Written for NetBSD and OpenBSD, but maybe working on other Platforms aswell.

                  devstat library based input. You can find this on FreeBSD based systems.

                  framework IOKit based input. You can find this on Darwin systems like MacOSX.

                  same as libstatgrab but for disk io (


       You can select several different ways to output the data gathered by bwm-ng.

       You can use one of:

                  This  is  the default output method. Usually this fits you the most.  In curses
                  mode you can control bwm-ng with several keys.  Press 'h' for a online help. To
                  quit using this mode either press 'q' or ctrl-c.

                  Shows bar charts of the current IO, using curses output.

                  Plain  or  ASCII  is  mostly  a  backup  if curses is not available. You cannot
                  control bwm-ng at all in this mode. To quit press ctrl-c.  But for  one  single
                  single output using this is the mode that fits the best.

                  CSV is designed to use with scripts for easy parsing.

                  Type rate:
                  unix timestamp;iface_name;bytes_out/s;bytes_in/s;bytes_total/s;bytes_in;bytes_out;packets_out/s;packets_in/s;packets_total/s;packets_in;packets_out;errors_out/s;errors_in/s;errors_in;errors_out\n

                  Type svg, sum, max:
                  unix timestamp;iface_name;bytes_out;bytes_in;bytes_total;packets_out;packets_in;packets_total;errors_out;errors_in\n

                  To skip the first output with only zeros use:
                  bwm-ng -o csv -c 0

                  This is designed for use in the WWW. It uses the CSS file bwm-ng.css in current
                  working dir. "--htmlrefresh" only affects  the  refresh  of  the  page  by  the
                  browser. For best results use the same value for --timeout and --htmlrefresh.


       The options that are recognized by bwm-ng can be divided into 3 different groups. The long
       versions can only be used if bwm-ng was compiled with getopt_long.

       These options specify the method to gather the data as well as different options for them.

       -i, --input method
              selects which method to use. It can be one of the  above  (see  INPUT  METHODS)  if
              support for it was compiled in.

       -f, --procfile filename
              selects the file to parse in proc input method. This is usually /proc/net/dev.

           --diskstatsfile filename
              selects the file to parse in disk input method. This is usually /proc/diskstats.

           --partitionsfile filename
              selects  the  file  to parse in disk input method on older Kernel.  This is usually

       -n, --netstat path
              specifies the binary to execute for netstat input method. Because  this  may  be  a
              security flaw support for this option is not compiled in bwm-ng by default.

       These options select the way to output the data and several options for the output.

       -o, --output method
              selects  which  method  to  use  for output. It can be one of the above (see OUTPUT
              METHODS) if support for it was compiled in.

       -u, --unit value
              selects which unit to show. It can be one of bytes, bits, packets or errors.

       -T, --type value
              specifies the type of stats to show. Use one of rate for the  current  rate/s,  max
              for  the  maximal  value  achieved  since  startup of bwm-ng, sum for the total sum
              counted since startup of bwm-ng or avg for the average over the last 30 seconds.

       -c, --count number
              number of outputs for Plain and CSV output mode. Use '1' for  once  single  output.
              Using '0' in CSV mode will skip first output that always consists of zero values.

       -C, --csvchar char
              specifies the delimiter char for CSV mode. The default is ';'.

       -F, --outfile filename
              specifies  the use of a outfile instead of stdout. This option only affects CSV and
              HTML mode.

       -R, --htmlrefresh seconds
              sets the HTML Meta refresh field to seconds in HTML mode.  This will  result  in  a
              reload  of  the page every n seconds by the browser. If this is set you want to use
              --htmlheader as well.

       -H, --htmlheader [value]
              if this option is used, bwm-ng will print the correct HTML  header  (<html></html>)
              including  Meta  fields  before  and after data.  This is only useful in HTML mode.
              value can be 0 (off) or 1 (on), if the value is not given '1' is used.

       -N, --ansiout
              disable ANSI Codes for Plain output.

              show long realnames of disks in Darwin (ioservice input)

       These options specify the general behavior of bwm-ng.

       -t, --timeout msec
              displays and gathers stats every  n  msec  (1msec  =  1/1000sec).  The  default  is

       -d, --dynamic [value]
              shows  bytes  and  bits with dynamic unit like K, M or G (Kilo, Mega, Giga).  value
              can be 0 (off) or 1 (on), without a value '1' is used.

       -a, --allif [mode]
              specifies whether only up and selected interfaces (mode=0), all which  are  up  but
              maybe not selected (mode=1) or all, even down and not selected interfaces (mode=2).
              If no interface list given (--interfaces) mode=1 and mode=2 are the same.

       -I, --interfaces list
              show only interfaces which are in this comma separated list  (whitelist).   If  the
              list  is  prefixed  by a '%' its meaning is negated and interfaces in this list are
              hidden from output (blacklist). (Example: %eth0,tun0)

       -S, --sumhidden [value]
              if given and the optional  value  is  not  0,  count  also  hidden  and  not  shown
              interfaces for total value.

       -A, --avglength seconds
              sets  the  span  in  which  the stats for average mode are collected. Default is 30
              seconds or 2*timeout.

       -D, --daemon [value]
              fork into background and daemonize if given and the optional value is not 0.   This
              only affects HTML and CSV mode and --outfile is required.

       -h, --help
              show a help of command line options.

       -V, --version
              print version info


       The  behavior  of  bwm-ng can be also controlled by a configfile.  By default bwm-ng first
       reads /etc/bwm-ng.conf and then ~/.bwm-ng.conf. If specified on command line bwm-ng  skips
       those.   It consists of the same long-options as used for command line as keys followed by
       a '=' and the value. Lines starting with a # or unknown key will be ignored.

       For example:


       bwm-ng.css the CSS file used for html output.


       bwm-ng.conf-example for an example of the configfile, README for other comments and  hints
       about bwm-ng. for new version or further help and links.


       Volker Gropp <> wrote bwm-ng and is current maintainer.
       For further Authors please refer to AUTHORS file which should come with bwm-ng.

                                            2007-03-01                                  bwm-ng(1)